在伪瞬态LMXB中发现长期超轨道周期性：IGR J17098-3628和EXO0748-676
Discovery of long-term superorbital periodicities in the pseudo-transient LMXBs: IGR J17098-3628 and EXO0748-676
摘要：
由罗西X射线定时探测器上的全天监视器对最近发现的X射线瞬变IGR J17098-3628进行的长期监测表明，它在其“活动”状态（即大约MJD 53450-54200）的数据中显示出长期（~ 163 d）的准周期调制。此外，这个光变曲线并不是典型的“经典”软X射线瞬变，因为J17098-3628自最初发现以来一直保持活跃，并且可能更类似于伪瞬变EXO 0748 -676，后者现在被归类为持久的低质量X射线双星。然而，EXO 0748 -676最近进入了一个更活跃的阶段（大约从MJD 53050开始），因为我们发现它的光变曲线也显示出准周期调制（~ 181 d）。这一定是一个“超轨道”的调制，因为EXO 0748 -676的轨道周期已经被确定（3.8小时），因此我们将这两个天体的长周期解释为代表了吸积盘的一些内在性质（例如耦合的岁差和翘曲效应）。通过类比，我们认为IGR J17098-3628是这类伪瞬态LMXB的另一个成员，并且可能具有<1d的轨道周期。
英文摘要：
Long-term monitoring of the recently discovered X-ray transient, IGR J17098-3628, by the All Sky Monitor on board the Rossi X-ray Timing Explorer, has shown that it displays a long term (~163d) quasi-periodic modulation in the data spanning its "active" state (i.e. approximately MJD 53450-54200). Furthermore, this light-curve is not typical of "classical" soft X-ray transients, in that J17098-3628 has remained active since its initial discovery, and may be more akin to the pseudo-transient EXO0748-676, which is now classified as a persistent Low Mass X-ray Binary. However, EXO0748-676 recently entered a more active phase (since approximately MJD 53050), since when we find that it too displays a quasi-periodic modulation (~181d) in its light-curve. This must be a "superorbital" modulation, as the orbital period of EXO0748-676 is well established (3.8hrs), and hence we interpret both objects' long periods as representing some intrinsic properties of the accretion disc (such as coupled precessional and warping effects). By analogy, we therefore suggest that IGR J17098-3628 is another member of this class of pseudo-transient LMXBs and is likely to have a <1d orbital period.
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